VS 2010 Combobox And Database Messes Up Form?
May 14, 2010
In my Thesaurus application, I use a combobox as a lookup for keywords. On the bottom of the form I have a datagridview that displays the synonyms for the currently selected keyword. The problem I'm having is that whenever I have selected a keyword that has synonyms, or in other words, whenever a keyword is selected that populates the datagridview, and at the same time I try to close the form or remove the keyword my form gets messed up.
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Jul 18, 2009
The problem I am running into is the OpenFileDialog box. I am allowing the user to pick an image and I want to save the image location into a column in the database(this isn't the problem), I know how to get the image location and save it...The main problem is this. Each time I open up the "OpenFileDialog box" and choose an image, it remembers the last location used, but after the image is chosen, the program looks at the images location as the spot the database is...To sum this up: Each time I use the "OpenFileDialog" and choose an image, the program looks at the images location for the database instead of in the "Debug folder" (which is were I put the database) So i end up getting an error that it can't find the database. Everything usually worked fine until I used the "OpenFileDialog"...
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Apr 13, 2012
I have created a database.Now I have created a windows form in which i have added some combo boxes.I want to select the value of the combo box and when ADD is clicked on the form it should be added to the database.In textbox we do Textbox1.text to select the value.What will we do in Combobox .
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May 5, 2012
I'm trying to fill a ComboBox with values from a column in a database...I'm trying to use code I found in jmcilhinney's CodeBank post at url. credits to him since it's basically 100% his code in my image below.I've tried 4 methods before this, and I've been receiving the same error, so it must be my fault... the image below shows the code and the problem.
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Oct 7, 2011
I'm loading 3 comboboxes and a treeview with values, from a remote database when the app starts. As we all know the app freezes until it's done loading. I want to speed things up.
Dim _thread As Thread
_thread = New Thread(AddressOf test_loading)
_thread.Start()
[code]....
When I execute this code I get the following error:
mycomboboc.Items.Add(reader.Item("columnname").ToString)Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on.
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Dec 12, 2011
I'm recreating an old 16 bit game. I'm creating the chat normally displayed at the bottom.Each sentence transitions in character-by-character.Every time a character is added, I wanted to have it make that little bleep noise. I've got a wav file that contains a short 'blip' that sounds just right, problem is, when I have it do the blip every time, it usually messes up.
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Sep 7, 2009
i have imported names from database table into combobox..i want to add item"all" above all names..how can i just add one single item in combobox after populating it form database tabel.
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Dec 7, 2011
I use this code to populate info from Access DB to txtBox[code]...
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Dec 8, 2011
this code links to the access database but but I just get only the first row in each combobox...
and I want also cboBox3 depend from cboBox2 depends from cboBox1, how can I do it?
Imports System.Data
Imports System.Data.OleDb
Public Class frm
Dim objConnection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source = DBSOURCEDB.mdb;Jet OLEDB:Database Password=pass;")
[Code]...
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Jul 30, 2009
small but huge conversion problem i am facing.. i have this code to convert an entire folder from text to rtf and it works swell.then i have this code to convert rtf to text, and that is where the problem is:
Try
Dim sourcePath As New System.IO.DirectoryInfo(tfcrtfdir.Text) 'rtf selected folder
Dim targetPath As New System.IO.DirectoryInfo(tfctxtdir.Text) 'txt selected folder
[code].....
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Jan 8, 2011
I'm having some problems with a Windows Application where I have deselected the application framework to be able to use Sub Main().I want to use Sub Main() because then I can do some things without showing any graphic interface to the user. Things such as automatic update and checking if another instance of the application is running.After checking these things, I execute these lines to run my application:
vb.net Dim frmMain As New frmMain() Application.Run(frmMain)
I need to run it this way or else the application will close when Sub Main() ends. The Application.Run keeps the application alive until I exit the main thread.However, this causes some problems with a variable, no information can be saved into it, I don't know if it affects any other variables as I haven't noticed it. However, I save a string to the variable and then when trying to compare it, the variable is string.empty.Could it be Application.Run which is messing things up? Should I do frmMain.Show() and keep the application running with some sort of WaitUntilExit?
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Feb 17, 2011
I have an error when converting a text string to date, I've tried all the date conversions I can think of and still get the same error (cdate, date.parse and Convert.ToDateTime) this happens after I export an RDLC report to a PDF. As you can see in the below code, there are 2 identical variables called newDate1 and newDate2, one being declared before the render and the other being declared after the render. The first one works no problem but the second one I get the error: Conversion from string "16/02/2011" to type 'date' is not valid. This now becomes a program wide error and affects every date conversion done in the program, this problem remains until the program is restarted.
In short: CDate converts MM/DD/YYYY no problem, but after a PDF export it tries to convert to DD/MM/YYYY which gives an error
Public Function ExportPDFReport(ByVal ReportPath As String) As String
Dim newDate1 As Date = CDate("16/02/2011")
Dim bytes As Byte() = uxReportViewerRDLC.LocalReport.Render("PDF")
[CODE]...
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Jul 14, 2010
This is well documented and easy to accomplish in Access, but how does one accomplish this in Visual Basic 2010 on a form designed in Visual Studio that is bound to a SQL Server database?
The idea is to create a combobox that holds 2 columns - a primary key value and a unique value such as a [Company Name] or a [Student Name]. The user would then find the appropriate record within the combobox and the code behind the combobox control would then perform a .findfirst method that would NOT filter out all other records, but would rather use selectedvalue primary key column value to move to the selected record.
I am currently getting into VS 2010 & revisiting VB having been programing in ACCESS & VBA for years. In the Access/VBA environment it is very common to have to find a given record on a given form using this method, but it would appear to be poorly documented if in fact not commonly used in the VB.NET/VS community.
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Jul 14, 2010
This is well documented and easy to accomplish in Access, but how does one accomplish this in Visual Basic 2010 on a form designed in Visual Studio that is bound to a SQL Server database?
The idea is to create a combobox that holds 2 columns - a primary key value and a unique value such as a [Company Name] or a [Student Name]. The user would then find the appropriate record within the combobox and the code behind the combobox control would then perform a .findfirst method that would NOT filter out all other records, but would rather use selectedvalue primary key column value to move to the selected record.
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Aug 29, 2009
This is the code that i did to fetch data from the database and filling it to the combobox dropdown list at the form load event:
[Code]....
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Jul 16, 2011
it's just for a program registration. i would store all of the registration codes in the access database, then export it to XML, then upload it to my web host. I would then somehow connect it to my Visual Basics login form (Which I have already made). If this can't be done, having them register through the form and having all the allowed codes on the internet (So i can easily edit them)!
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Feb 20, 2012
I have a tab control application, each tab loads a particular user control and each of those user controls will then add other user controls that are used amongst other the user controls. For example, I have an "ucQuotes" page and an "ucInventory" page, when the specific tab is selected, the "uc****" user control is loaded on that page, and in the case of "ucQuotes" and "ucInventory" they both use a control called "ucPartNumber"; a user control consisting of a combobox, textbox, and button. I have no issues reusing the shared user controls, in this case. My problem arises with my "ucQuickPrice" control, as it is always present at the bottom of the tab control form (separate from the tabcontrol, but on the same form), and it too uses ucPartnumber.
Here's my issue, as I type into the ucPartnumber combobox, the text I type does not appear in the combobox, it appears in the textbox of the ucPartnumber control that is being used on the tabcontrol page. There are no shared instances of ucPartNumber, nor do I have this issue between typing on one tab page and the text showing on the user control of another tab page.I tried just creating the ucPartNumber controls on the ucQuickPrice control, not adding a new instance of ucPartnumber on the .Load event, and the issue persists.
The combobox(s) in question are bound programmatically with about 40,000 items, ".datasource = dataset.tablename" not to a bindingsource. Autocomplete is set to none, I added code to utilize tool tips and the basic combobox filtering functionality. Is this a bug, or is there something I'm neglecting? I'm about 95% complete with this application, and this just happened today. I made the decision, to just reuse the ucPartNumber control on the ucQuickPrice control (originallly it's size and orientation would not fit, but I added some coding to detect what parent is adding ucPartNumber and to change its appearance accordingly). Before, I made this change, I did not have this problem. And, in trying to go back to how I had things set up before the change, the problem will not go away. if the whole control within a control verbage I used is a bit confusing, let me know and I'll try to better explain what is happening. At this point, I'm going to close and reopen vbexpress, as when I started this ordeal, vb started acting weird and wanted me to save all my work, it usually does this before locking up.
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Sep 28, 2011
I have a table in my database with 5 columns (ID1 to ID5) and just one row. I'm trying to bind a comboBox, to show ID1 through ID5 in the combobox when my form loads. I have a dataset and tableAdapter's made for this already. I just want to know how to bind a combobox to those ID values.
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Mar 14, 2011
I made an input form that I want to work like a daily diary. The user inputs a title, date, time, and the actual text entry. At the end is a button and I think I have to make a click "event" to make all the text from the input boxes get stored somewhere. I want each of these submissions to be separate for each day with the capability of showing the journal entry for each day later on.
I am a novice, but I think the data needs to go to a database. Cannot find any sample code to make the form data save to a database. The database I made is "a local database." Not sure if it needs to be "Dataset" or "Entity Data Model".
Please show me some code for this or a way to save information without a database only using vb code.
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Feb 25, 2010
i am working on a project that involves checking that a persons login and password are that of held in the database each person has a seperate username and password i seem to have stumbled across an error. here is the code and i will underline the problems
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Jan 22, 2012
I am creating a program for an existing database that stores the info into the database. So can I link an already existing database in MS Access to a GUI?
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Dec 18, 2010
I make simple project for editing ms access vith visual basic 2010. I use dataset to communicate with ms access. When i add record and clik buton save on binding navigator this record is displayed in grid view. When I exit and retur in form all records are displayed, but when I open ms access file added record are not in database. When i open dataset for configure and execute insert query this record is added to ms access file.I understand this, when i use sql connection this form is work correctly. Where is error sparc
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Apr 6, 2011
guys can you give me a simple login form that check if the username and the password is in the database.. im using a ms access database..
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Feb 9, 2011
I m creating a Log In form at VB.NET and i have some problems The connection between the application and the web server opens fine and i can login if i use the MD5 encrypted text of the database.
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Apr 18, 2012
I use this code to insert datab from my VB.Net form into my MS Access 2003:
[Code]...
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Jan 2, 2012
The project must have different user and each has username and password will be saved in my database but only the admin can add users.
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Aug 22, 2011
I am having issues when trying to populate a combobox that is dependent on another combobox. Populating the first combobox works as expected but attempting to set the value member or display member properties of the first combo box cause its selected index changed event to fire. That event seems to fire before the first combobox is fully loaded. The issue is then raised when trying to populate the second combo box, since it is dependent on having a valid value member to complete the dynamic sql statement, and at that point in time, there is no value member.
I can�t imagine that this is difficult but searching hasn�t yielded me any results. Should I be using a different event? What is the right way to do this?
I have a simple workaround in place - not allowing the second combo box to attempt to populate unless the first combobox has an index greater than zero but this hack is no good since it clearly prevents the user from selecting the first element in the first combo box.
Private Sub SpecialsForm_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim sql As String
Dim dt As New DataTable
[Code].....
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Feb 27, 2012
how to create a program that can access information held in an excel database and show it in a simple form.
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May 11, 2011
create admin form to register, Remove, Edit user accounts in the system connected to Microsoft SQL Server R2 2008 or access database ? any toturial videos or instructuions step by step ?
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May 31, 2008
I have a parent form that has a combobox. Whn the form loads I get the data from the db and bind to the combobox. that works fine and here is the code I use in form load to cause this to happen: [code] Now if there is not an Account Type, I have a button that will pull up a small form to allow the addition of an account type. The popup form adds the data back to the database just fine, but I am now trying to get the combobox to refresh its data. So I call a public Sub that is located in the parent form to from the popup form to accomplish this task and I have walked the code and the sub is called and appears to work correctly, but the new data never appears in the combobox. Here is my public sub that i call to try and refresh the combobox on the parent form. [code] But when I go back to the parent form, the combobox is not updated with the new account. How can i get the combobox to refresh from the database with the new data?
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